Vanilla Bean Sweet Potato Waffles

Name: Vanilla Bean Sweet Potato Waffles
Ingredients: 2 small sweet potatoes, roasted and cooled; 1 1/2 cups all-purpose flour; 2 teaspoons baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon salt; 2 teaspoons pumpkin pie spice; 1/2 teaspoon ground cinnamon; 1/4 teaspoon freshly grated nutmeg; 2 tablespoons packed brown sugar; 1/2 vanilla bean, split and seeds scraped (or 2 teaspoons pure vanilla extract; 2 large eggs; 5 tablespoons unsalted butter, melted; 1/4 cup maple syrup; 1 1/4 cup buttermilk